| Navy | The Soviet Navy |
| Type | Submarine |
| Class | M (Malyutka) |
| Pennant | |
| Mod | 3rd group (Type XII) |
| Built by | Krasnoye Sormovo (Gorkiy, U.S.S.R) / Yard 112 |
| Ordered | |
| Laid down | 31 Aug 1938 |
| Launched | 25 Feb 1940 |
| Commissioned | 7 Nov 1940 |
| Lost | 17 Dec 1942 |
| History | Black Sea fleet. Went missing in the area off Fidonisi Island after 17 December 1942. |
We don't have any commands listed for USSR M-31
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Notable events involving M-31 include:
17 Aug 1942
M-31 fires two torpedoes against 'what is identified as' an enemy merchant off Odessa in position 46.20N, 30.45E. Both torpedoes missed their target.
6 Oct 1942
M-31 torpedoed and sank the Romanian tug Mina Daniel (293 GRT) North-East of Sulina, Romania in position 45°47'N, 30°19'E.
4 Nov 1942
M-31 fires two torpedoes against the Romanian merchant Bessarabia (6672 BRT) north-east of Sulina, Romania in position 45°48'N, 30°11'E. Both torpedoes missed their target.